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Have the ABS system tested for trouble codes and post them on this page. As for the red brake light, check and see if the float inside the brake master cylinder is floating and not sunk to the bottom which will cause the light to come on.
The float free floats. It informs the instrument cluster and ABS module the level of the brake fluid in the reservoir. If you pushed your finger into the hole is it went to the bottom, the float is at the bottom and that will cause the red brake light to come on.
If you have a small mirror and a flash light, you can look into the opening and see if the float is up.
It should be right at the top of the fluid.
Other wise, I know it is tight. You can unbolt it and lave the lines attached and pull it from under the wiper cowl panel and see if the float is up.
No, you fine with the questions. That is why we are here.
Ford has no pictures of the master cylinder blown apart.
No problem. Just reply back when your ready.